BS EN 14972-9:2020 pdf free.Fixed firefighting systems一Water mist systems Test protocol for machinery in enclosures not exceeding 260 m’ for open nozzle systems.
BS EN 14972-9 The water mist system, operating without manual intervention, shall successfully complete all described performance fire tests for their specific applications.The fire tests shall be conducted until the fire is extinguished, as required by the applicable fire test. System components, component locations, operating conditions and test enclosure details shall remain unaltered throughout all of the fire tests for a given application. All fire tests shall be conducted using the specifications from the manufacturer’s DIOM manual in regard to nozzle placement, spray flux, and spray duration. Sprays can be continuous or intermittent in time. In the case of intermittent, or cycled, sprays, the time period during which the system is not discharging shall not be greater than 50 % of one complete on/off cycle. The system off period shall not exceed one minute.In conjunction with the performance fire tests, all twin fluid water mist systems (except for those applying compressed air) shall be subjected to a straight discharge test with no fire to evaluate the resulting discharge and oxygen concentration. This evaluation shall be conducted using the maximum extinguishing agent flow and pressure. The discharge duration for the test shall be the maximum required for the system and occupancy to be protected. Oxygen measurements shall be recorded at a location(s) within the test enclosure. This information shall be used to evaluate personnel safety, and shall be accounted for in the manufacturer’s DIOM manual.The test enclosure volume shall have main dimensions of 7,30 m by 7,30 m by 4,90 m high. The  enclosure shall be constructed of wood or metal frame with an inner lining of minimum 13,00 mm gypsum or 0,70 mm galvanized steel (see Figure 1). To minimize leakages, all joints and gaps shall be sealed. At 2,70 m from one of the enclosure corners, in one of the walls parallel to the machinery equipment mock-up, a 0,80 m by 2,00 m high personnel door shall be installed with a locking
mechanism.BS EN 14972-9 pdf download.